Roll finisher



2 Sheets-Sheet l INVENTOR:

644,64 HIS ATTO EY.

W) H m w 5 W a M m D. w. BRAYSHAW ROLL FINISHER Fil ed Aug. 15, 1959 June 16, 1942.

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June 16, 1942. v D. w. BRAYSHAW 2,286,596

ROLL FINISHER Filed Aug. 15', 1939 2 Sheets-Sheet 2 i h r w rm??? J0 a" J0 24 51 FIEAL- FIEQE.

INVENTOR.

jui y/JG" H IS ATT NEY.

Patented June 16, 1942 UNiTED STATES ram OFFICE ROLL FINISHER Daniel W. Brayshaw, Vandergrift, Pa.

Application August 15, 1939, Serial N0. 290,280

1 Claim.

The present invention relates to improved means for abrading or grinding the surfaces of rolls so as to polish them and maintain the surface in a uniform condition. While not limited thereto, the invention is particularly well suited for grinding and polishing the surface of a work roll of a rolling mill so as to maintain its surface smooth and free from scale such as accumulates when rolling sheets or the like. The invention contemplates the provision of a plurality of abrading elements supported by a series of telescopically nested sleeves, each carrying a respective holder for one of the elements, there being means tending to rock each sleeve on its axis, the telescoping sleeves being supported by a rod which is reciprocated longitudinally so that the several abrading elements will play over the surface of the work to be ground or polished. The above and further features of the invention will be fully apparent from the following detailed disclosure when read in connection with the accompanying drawings, and will be pointed out with particularity in the appended claim.

In the drawings, Figure 1 is a plan of a portion of a rolling mill equipped with the improved grinding or polishing mechanism of the present invention.

Figure 2 is a front elevation thereof, with parts broken away in the interest of clarity.

Figure 3 is an enlarged vertical section on line IIIIII of Figure 2.

Figure 4 is a similar section on line IVIV of Figure 2.

Figure 5 is an enlarged detail, partly in plan and partly in horizontal section, illustrating the nested arrangement of sleeves supporting the holders for the abrasive elements.

Figure 6 is a detail view of an abrasive holder.

Referring in detail to the drawings, l0 and [2 represent the housings of a conventional type of rolling mill which support in the usual manher an upper roll [4 and a lower roll I6. In the embodiment of the invention illustrated, means are provided for dressing and polishing the upper roll by reciprocating a multiplicity of abrading elements i8 longitudinally or in the direction of the axis of rotation of the rolls.

Each abrading element comprises a stone I8 carried in a holder 2|] such as shown in detail in Figure 6. Each stone holder has a hub portion 22 of forked shape and is provided at one end face with a notch 24. This notch is engaged with a lug 25 of a collar 28 which is secured by set screw 36 to the respective sleeve 32 for the stone holder. As is clearly apparent from Figures 1 and 5, there are a plurality of sleeves nested telescopically, and each stone holder is positioned on its respective sleeve between collars 28 and 34 which are secured to the sleeve, there being a loose washer 36 between each collar 34 and the hub of the stone holder. The mounting of all the stone holders on their respective sleeves is substantially identical except that the sleeve for the holder at the extreme right in Figures 1 and 2 terminates at the right-hand face of the hub of the holder. This extreme right-hand holder hub bears against a washer 38 which in turn is held against endwise movement by a collor 40 secured to a rod 42 which extends longitudinally through all of the nested sleeves. This rod 42, as shown at the right in Figures 1 and 2, is slidingly supported on a grooved roller 44 journaled in a bracket 46 se-- cured to the housing I2.

The rod 42 is operatively connected by a link 48 with a crank 50 secured to a crank shaft 52 which is driven through suitable reduction gearing by a motor 54 secured to supports 56 carried by the housing 12. The housing also carries bushings 51 and 59 which guide the rod 42 and nested sleeves 32 as shown.

The housing II] has secured thereto a bracket 58 in which is mounted a grooved guide roller 60 on which rides the outermost sleeve 32.

Secured to the left extremity of each sleeve 32 is a hub 62 having a rod-like arm 64 on which is adjustably mounted a weight 66 adapted to be secured in a desired position or adjustment by set screw 68. A collar 10 near the left extremity of the rod 42, in conjunction with the collar 40 above referred to, serves to properly position the assemblage of sleeves, stone holders, and weighted arms carried thereby.

With the parts constructed and arranged in the manner shown and described, it is apparent that when torque is applied to the crank shaft 52, the rod 42 will be reciprocated axially and will thus cause the several abrading or polishing elements [8 to be traversed across the working face of the roll 14. Because each stone holder is mounted on an individual sleeve and each sleeve is yieldingly urged to turn on its axis by a respective counterweight, selected portions of the roll face can be subjected to predetermined abrasive pressures. It is apparent that variation of the pressure exerted by any individual polishing stone or abrading element may be secured by varying the position of the counterweight 65 on the corresponding arm 64.

Conventional mill rolls are frequently ofthe order of 32 inches in diameter, vary in rolling surface length from 36 to 82 inches, and rotate at approximately 30 R. P. IVL, giving a peripheral speed of approximately 251 feet per minute. For finishing or polishing such rolls and maintaining them in proper working condition, it has been found that a 2-horsepower motor with an appropriate gear reduction will actuate the crank shaft at an appropriate speed to cause the grinding elements to reciprocate back and forth across the surface of the roll at approximately 38 strokes per minute. In this way it has been demonstrated that the surfaces of work rolls can be maintained smooth and free of the scale which tends to accumulate on the surface when rolling sheet steel or the like. In practice it has been found that the overlapping spiral action obtained by the combined reciprocation of the abrading element and rotation of the roll effects the elimination of line polishing and resultant rupture of the sheet surface oxide on the products.

The polishing mechanism shown and described is arranged to function simultaneously with the rolling of the product. The abrasive or polishing pressure per inch face width of each individual stone can be varied from to approximately 25 pounds or more. The means described for slidingly supporting the assemblage is such that there is freedom from binding when the mill housings become loose and bounce and move on their foundations. The particular forked stone holder illustrated facilitates ready removal thereof for the purpose of making the necessary stone changes during the life of the apparatus. The parts are so disposed that the do not interfere with the clear vision of the mill by the operator,

nor do they interfere with the operation of mechanical sheet feeders or catcher tables fre- .quently used in mills of this character, The grinding or abrading elements are located on that side of the mill known as the catchers side. This prevents grit from entering the bite of the rolls which might cause bad surfaces on the sheets being rolled. The advantages inherent in the disclosed and claimed arrangement have been demonstrated by actual reduction to practice. While I have described quite specifically the embodiment of the invention illustrated, it is to be understood that detailed modifications and substitutions of equivalents may be made Without departure from the invention as defined in the appended claim.

I claim:

Mechanism of the character described comprising a plurality of abrading elements, a series of at least two telescopically nested sleeves each carrying a respective holder for one of said elements, a respective arm and weight tending to rock each sleeve on its axis, a supporting member common to said series of sleeves, means slidably supporting the assemblage, means for reciprocating said member, each of said holders having a hub portion of fork-like form to permit its removal from the sleeve by a movement perpendicular to the axis thereof, and wherein the supporting sleeve has collars affixed thereto for restraining the holder against movement longitudinally thereof, said holder hub and one of said collars having a slot and lug connection so as to transmit turning movement of the sleeve to the holder.

DANIEL W. BRAYSHAW. 

